Starting from Thursday 24th July, Subway will be running a National Breakfast promotion across five national newspapers offering a free bacon breakfast Sub for every reader.

They will be running vouchers in the Metro, i, Mirror and Record in July and then in the Daily Star and Express in August. Each voucher will be valid for 3 days.

I believe the publication dates are as follows:
Daily Mirror - 24th July
Metro - 25th July
i - 26th July
Daily Express- 10th August
Daily Star - 16th August